Comment by iopq
6 years ago
The code that determines truths about the data never had to be rewritten.
Like, are the two points neighbors? I mean, I'm not going to write a version of this function for a spherical board in the future. Nobody plays on a spherical board.
It's also a really boring unit test. Yes, (1,1) and (1,2) are neighbors. Do I really need to test this function until the end of time?
Thats exactly the type of code that should be unit tested. The unit tests are trivially easy to write, and a very naive solution is easy to code up. The tests should take up a negligible overhead in your overall test suite runtime. Then when it comes time to optimize the code because its becoming a bottleneck you can be confident that the more obscure solution is correct.